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Re: [RFI] Line noise vs Frequency

To: rfi List <rfi@contesting.com>
Subject: Re: [RFI] Line noise vs Frequency
From: Charles Plunk <af4o@twc.com>
Date: Tue, 10 Aug 2021 12:54:03 -0500
List-post: <mailto:rfi@contesting.com>

Sounds like my neighborhood. In locating my last source (a horrible 20-30 over S9 on 75m), the most significant break through for me was matching the noise pattern to what I was hearing in my hf receiver. I accomplished this be retransmitting the hf receivers audio to one ht, while I df'ed on another ht on 2m AM and a portable 4 element yagi. With the 2 HT's in tow, when the 2 synced in noise pattern I knew I was at the correct pole. Next time I may try stereo headphones with one ht on one ear and the other on the other ear to reduce traffic noise etc.

Prior, I made the big mistake of df'ing for just max noise at the poles. These 7.2kv lines radiate a strong signal on 2m near almost every pole (corona?) but that was not what I was hearing on hf. To my surprise the target source was almost obscured by this noise with the portable 2m AM. Also, I waited to hunt until the target source had a distinctive pattern as it tended to vary and even go away with variances in weather primarily humidity.

I also have a FT-817 (actually 2) to df in lower or higher frequencies as needed. And adding to my portable yagis/  portable loops as I get time to build them.

Chuck

W4NBO

On 8/10/21 9:54 AM, Pete Smith N4ZR wrote:
Thanks, guys - I went out with my HF DF rig, and the one thing I'm pretty sure of is that the point source is not nearby.  Anywhere along the neighborhood-level feed that runs along the West side of my property I get a similarly high level, with no discernable local peak at a particular pole, so my suspicion is that the source is further down the line in someplace where I don't have access.  I have sent a recording and a request for help to my local power company guy, who tries very hard and has good gear but relatively little knowledge.  The line is probably 60 years old, dating to this subdivision's beginnings, and has required a lot of hardware replacement recently.

73, Pete N4ZR
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